Valve train of an internal combustion engine comprising a switchable, rotationally symmetrical component

A valve train of an internal combustion engine comprising a switchable, rotationally symmetrical component, said component comprising a housing that is mounted with an outer peripheral surface in a bore connected to the internal combustion engine, said housing further comprising a cavity which encloses an inner element that is axially displaceable relative to the housing, a coupling element being provided in the housing for coupling the inner element and the housing in a relative position to each other, and anti-rotation device in form of a first body that projects radially beyond the housing being guided in a first longitudinal groove of the bore of the internal combustion engine, wherein a second, pin-like body acting as a mounting safety device is arranged in a through-bore of the housing and extends radially inward and outward beyond the housing, said second body being guided with an outer section in a second longitudinal groove of the bore of the internal combustion engine, and the cavity of the housing comprises in a peripheral portion in which the second body is arranged, a material reduction into which an inner section of the second body extends.